{"abstract":"The workflow join operation is admitted even though a completion from a previous loop iteration satisfies the join.","category":"Workflow orchestration","checks":9,"contract":"Return a Boolean admission decision for release a workflow dependency join. The record r must satisfy all of: set(r['all_required'][0]) <= set(r['all_required'][1]); all(x == 'success' for x in r['success_policy']); all(x == r['branch_generation'][0] for x in r['branch_generation'][1]); r['release_once'] is False; not any(r['cancelled_branch']). Extra tracing fields are ignored; validation does not mutate the record.","evaluation_group":"xd-workflow-join","failed_approach":"Adding the branch generation check repairs the reported defect, but replacing the adjacent release once check loses that independent invariant.","family":"xd-workflow-join-branch_generation","id":"FA-1311","implementations":{"attempt":{"sha256":"d3ad882777567fc850a8b6cb756742966f338504fa118535514c93e313a269ba","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(r):\n    return (set(r['all_required'][0]) <= set(r['all_required'][1])) and (all(x == 'success' for x in r['success_policy'])) and (all(x == r['branch_generation'][0] for x in r['branch_generation'][1])) and (not any(r['cancelled_branch']))\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nr = {'all_required': [['a', 'b'], ['a', 'b']], 'success_policy': ['success', 'success'], 'branch_generation': [3, [3, 3]], 'release_once': False, 'cancelled_branch': [False, False]}\ncheck('valid operation', solve(r), True)\ncheck('A join proceeds before every required predecessor completes', solve(dict(r, **{'all_required': [['a', 'b'], ['a']]})), False)\ncheck('A success-only join treats failed predecessors as successful', solve(dict(r, **{'success_policy': ['success', 'failed']})), False)\ncheck('A completion from a previous loop iteration satisfies the join', solve(dict(r, **{'branch_generation': [3, [2, 3]]})), False)\ncheck('Duplicate predecessor events release the join twice', solve(dict(r, **{'release_once': True})), False)\ncheck('A cancelled required branch is silently omitted', solve(dict(r, **{'cancelled_branch': [False, True]})), False)\ncheck('unrelated tracing metadata', solve(dict(r, trace='run-'+str(N))), True)\ncheck('repeat validation is pure', solve(r), True)\ninvalid = {'all_required': [['a', 'b'], ['a']], 'success_policy': ['success', 'failed'], 'branch_generation': [3, [2, 3]], 'release_once': True, 'cancelled_branch': [False, True]}\nkeys = list(invalid)\npair = {keys[N % len(keys)]: invalid[keys[N % len(keys)]], keys[(N+1) % len(keys)]: invalid[keys[(N+1) % len(keys)]]}\ncheck('two independent violations in variant', solve(dict(r, **pair)), False)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"broken":{"sha256":"5a56a429262518f472a9dfe628f574964c5233c280cc8d2dd93d8d0fd9ad8258","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(r):\n    return (set(r['all_required'][0]) <= set(r['all_required'][1])) and (all(x == 'success' for x in r['success_policy'])) and (r['release_once'] is False) and (not any(r['cancelled_branch']))\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nr = {'all_required': [['a', 'b'], ['a', 'b']], 'success_policy': ['success', 'success'], 'branch_generation': [3, [3, 3]], 'release_once': False, 'cancelled_branch': [False, False]}\ncheck('valid operation', solve(r), True)\ncheck('A join proceeds before every required predecessor completes', solve(dict(r, **{'all_required': [['a', 'b'], ['a']]})), False)\ncheck('A success-only join treats failed predecessors as successful', solve(dict(r, **{'success_policy': ['success', 'failed']})), False)\ncheck('A completion from a previous loop iteration satisfies the join', solve(dict(r, **{'branch_generation': [3, [2, 3]]})), False)\ncheck('Duplicate predecessor events release the join twice', solve(dict(r, **{'release_once': True})), False)\ncheck('A cancelled required branch is silently omitted', solve(dict(r, **{'cancelled_branch': [False, True]})), False)\ncheck('unrelated tracing metadata', solve(dict(r, trace='run-'+str(N))), True)\ncheck('repeat validation is pure', solve(r), True)\ninvalid = {'all_required': [['a', 'b'], ['a']], 'success_policy': ['success', 'failed'], 'branch_generation': [3, [2, 3]], 'release_once': True, 'cancelled_branch': [False, True]}\nkeys = list(invalid)\npair = {keys[N % len(keys)]: invalid[keys[N % len(keys)]], keys[(N+1) % len(keys)]: invalid[keys[(N+1) % len(keys)]]}\ncheck('two independent violations in variant', solve(dict(r, **pair)), False)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"},"fixed":{"sha256":"6668b62a3353434e7dc560f349296dbc5221eaabe9e1fa91d6fd09b5166472cb","source":"\"\"\"Failure Map reference implementation. Python standard library only.\"\"\"\nimport json\n\nN = 1\nobservations = []\ndef solve(r):\n    return (set(r['all_required'][0]) <= set(r['all_required'][1])) and (all(x == 'success' for x in r['success_policy'])) and (all(x == r['branch_generation'][0] for x in r['branch_generation'][1])) and (r['release_once'] is False) and (not any(r['cancelled_branch']))\ndef check(label, actual, expected):\n    observations.append({\"check\": label, \"actual\": actual, \"expected\": expected, \"passed\": actual == expected})\nr = {'all_required': [['a', 'b'], ['a', 'b']], 'success_policy': ['success', 'success'], 'branch_generation': [3, [3, 3]], 'release_once': False, 'cancelled_branch': [False, False]}\ncheck('valid operation', solve(r), True)\ncheck('A join proceeds before every required predecessor completes', solve(dict(r, **{'all_required': [['a', 'b'], ['a']]})), False)\ncheck('A success-only join treats failed predecessors as successful', solve(dict(r, **{'success_policy': ['success', 'failed']})), False)\ncheck('A completion from a previous loop iteration satisfies the join', solve(dict(r, **{'branch_generation': [3, [2, 3]]})), False)\ncheck('Duplicate predecessor events release the join twice', solve(dict(r, **{'release_once': True})), False)\ncheck('A cancelled required branch is silently omitted', solve(dict(r, **{'cancelled_branch': [False, True]})), False)\ncheck('unrelated tracing metadata', solve(dict(r, trace='run-'+str(N))), True)\ncheck('repeat validation is pure', solve(r), True)\ninvalid = {'all_required': [['a', 'b'], ['a']], 'success_policy': ['success', 'failed'], 'branch_generation': [3, [2, 3]], 'release_once': True, 'cancelled_branch': [False, True]}\nkeys = list(invalid)\npair = {keys[N % len(keys)]: invalid[keys[N % len(keys)]], keys[(N+1) % len(keys)]: invalid[keys[(N+1) % len(keys)]]}\ncheck('two independent violations in variant', solve(dict(r, **pair)), False)\nprint(json.dumps({\"observations\": observations, \"passed\": all(x[\"passed\"] for x in observations)}, ensure_ascii=False))\nraise SystemExit(0 if all(x[\"passed\"] for x in observations) else 1)\n"}},"limitations":" This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.","method":"Deterministic executable model with adversarial boundary fixtures.","provenance":{"created_by":"Failure Map","dependencies":"Python standard library","family":"xd-workflow-join-branch_generation","generated_at":"2026-09-29T14:37:00.911144+00:00","license":"CC0-1.0","python":"3.12.14","seed":1,"split":"open-access"},"relevance":"A deterministic local contract for workflow orchestration. Each negative fixture violates exactly one invariant. No transport timing, persistence, cryptographic verification, or full protocol implementation is claimed.","repair":"Require all(x == r['branch_generation'][0] for x in r['branch_generation'][1]) together with every other stated precondition before accepting the operation.","root_cause":"The admission path omits the branch generation invariant while validating the other operation preconditions.","sha256":"0e11fc155cfbc4067767ac7b40d9091db8b217642eea9a6a4f61f1892033600c","title":"Release a workflow dependency join: A completion from a previous loop iteration satisfies the join · case 01","variant":1,"variant_policy":"Five numbered records share a model and may reuse boundary fixtures.","verification":{"attempt":{"elapsed_ms":50.607,"exit_code":1,"observations":[{"actual":true,"check":"valid operation","expected":true,"passed":true},{"actual":false,"check":"A join proceeds before every required predecessor completes","expected":false,"passed":true},{"actual":false,"check":"A success-only join treats failed predecessors as successful","expected":false,"passed":true},{"actual":false,"check":"A completion from a previous loop iteration satisfies the join","expected":false,"passed":true},{"actual":true,"check":"Duplicate predecessor events release the join twice","expected":false,"passed":false},{"actual":false,"check":"A cancelled required branch is silently omitted","expected":false,"passed":true},{"actual":true,"check":"unrelated tracing metadata","expected":true,"passed":true},{"actual":true,"check":"repeat validation is pure","expected":true,"passed":true},{"actual":false,"check":"two independent violations in variant","expected":false,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"valid operation\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"A join proceeds before every required predecessor completes\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"A success-only join treats failed predecessors as successful\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"A completion from a previous loop iteration satisfies the join\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"Duplicate predecessor events release the join twice\", \"actual\": true, \"expected\": false, \"passed\": false}, {\"check\": \"A cancelled required branch is silently omitted\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"unrelated tracing metadata\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"repeat validation is pure\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"two independent violations in variant\", \"actual\": false, \"expected\": false, \"passed\": true}], \"passed\": false}\n"},"broken":{"elapsed_ms":94.992,"exit_code":1,"observations":[{"actual":true,"check":"valid operation","expected":true,"passed":true},{"actual":false,"check":"A join proceeds before every required predecessor completes","expected":false,"passed":true},{"actual":false,"check":"A success-only join treats failed predecessors as successful","expected":false,"passed":true},{"actual":true,"check":"A completion from a previous loop iteration satisfies the join","expected":false,"passed":false},{"actual":false,"check":"Duplicate predecessor events release the join twice","expected":false,"passed":true},{"actual":false,"check":"A cancelled required branch is silently omitted","expected":false,"passed":true},{"actual":true,"check":"unrelated tracing metadata","expected":true,"passed":true},{"actual":true,"check":"repeat validation is pure","expected":true,"passed":true},{"actual":false,"check":"two independent violations in variant","expected":false,"passed":true}],"passed":false,"stderr":"","stdout":"{\"observations\": [{\"check\": \"valid operation\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"A join proceeds before every required predecessor completes\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"A success-only join treats failed predecessors as successful\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"A completion from a previous loop iteration satisfies the join\", \"actual\": true, \"expected\": false, \"passed\": false}, {\"check\": \"Duplicate predecessor events release the join twice\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"A cancelled required branch is silently omitted\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"unrelated tracing metadata\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"repeat validation is pure\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"two independent violations in variant\", \"actual\": false, \"expected\": false, \"passed\": true}], \"passed\": false}\n"},"fixed":{"elapsed_ms":39.776,"exit_code":0,"observations":[{"actual":true,"check":"valid operation","expected":true,"passed":true},{"actual":false,"check":"A join proceeds before every required predecessor completes","expected":false,"passed":true},{"actual":false,"check":"A success-only join treats failed predecessors as successful","expected":false,"passed":true},{"actual":false,"check":"A completion from a previous loop iteration satisfies the join","expected":false,"passed":true},{"actual":false,"check":"Duplicate predecessor events release the join twice","expected":false,"passed":true},{"actual":false,"check":"A cancelled required branch is silently omitted","expected":false,"passed":true},{"actual":true,"check":"unrelated tracing metadata","expected":true,"passed":true},{"actual":true,"check":"repeat validation is pure","expected":true,"passed":true},{"actual":false,"check":"two independent violations in variant","expected":false,"passed":true}],"passed":true,"stderr":"","stdout":"{\"observations\": [{\"check\": \"valid operation\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"A join proceeds before every required predecessor completes\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"A success-only join treats failed predecessors as successful\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"A completion from a previous loop iteration satisfies the join\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"Duplicate predecessor events release the join twice\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"A cancelled required branch is silently omitted\", \"actual\": false, \"expected\": false, \"passed\": true}, {\"check\": \"unrelated tracing metadata\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"repeat validation is pure\", \"actual\": true, \"expected\": true, \"passed\": true}, {\"check\": \"two independent violations in variant\", \"actual\": false, \"expected\": false, \"passed\": true}], \"passed\": true}\n"}},"verified":true,"visibility":"public"}